Name: MMS3120/022-000 EPRO Module in stock
Price: 2564 CNY
Availability: InStock

Description

Power Supply Wiring

Rated Power Supply: Connect the auxiliary power supply to terminals L (phase) and N (neutral) as specified in the product datasheet. Ensure the supply voltage matches the rated range (typically 110–240 V AC, 50/60 Hz; confirm via ABB official manual).

Polarity Note: Observe correct wiring of L and N to avoid device malfunction. Use copper conductors with cross-sectional area 1.0–2.5 mm² (stranded or solid) based on installation environment.

Motor Connection (Current Sensing)

CT Wiring: Connect secondary windings of current transformers (CTs) to terminals I1, I2 (Phase 1), I3, I4 (Phase 2), I5, I6 (Phase 3). Ensure CT ratio (e.g., 50/5 A, 100/5 A) is compatible with the relay’s current range (refer to ABB technical specifications).

Polarity Alignment: Match CT polarity marks (e.g., “P1″/”S1”) with relay terminal labels to ensure accurate current measurement. Do not open CT secondary circuits when energized to prevent dangerous voltage buildup.

3-Phase Wiring: For 3-phase motor protection, wire all three phases; single-phase applications require appropriate CT configuration as per ABB guidelines.

Control Signal Wiring

Trip Outputs: Terminals NO1/NC1 (Normally Open/Normally Closed) and NO2/NC2 serve as trip outputs. Connect to contactors or circuit breakers for motor shutdown. Use 1.0–1.5 mm² conductors, and ensure output contact rating (AC-15: 250 V AC, 5 A; confirm via ABB datasheet) matches the load.

Control Inputs: Terminals DI1–DI4 (Digital Inputs) support external control signals (e.g., start/stop commands, remote reset). Wire to auxiliary contacts of control buttons or PLC outputs, with input voltage compatible with the relay’s digital input range (e.g., 24 V DC, 110 V AC).

Signal Integrity: Keep control wiring separate from power cables to minimize electromagnetic interference (EMI). Use shielded cables for long-distance runs, grounding the shield at one end.

Communication Wiring (If Equipped)

Bus Connection: For models with communication 功能 (e.g., Modbus RTU, Profibus DP), wire the communication bus to terminals COM+, COM- (Modbus) or corresponding Profibus terminals. Follow ABB’s bus wiring guidelines for termination resistors (120 Ω) at bus endpoints.

Cable Specifications: Use twisted-pair shielded cable (e.g., CAT5e for Modbus, Profibus-specific cable) with cross-sectional area 0.6–1.0 mm². Maintain bus length within limits specified in ABB’s communication manual (e.g., Modbus RTU: up to 1200 m at 9600 baud).

Grounding Requirements

Protective Earth (PE): Connect the relay’s PE terminal (marked ) to the system’s protective earthing conductor (cross-sectional area ≥ 2.5 mm² for copper) to ensure electrical safety and noise suppression.

Functional Ground: For communication and signal circuits, implement functional grounding as per ABB’s EMC (Electromagnetic Compatibility) recommendations to enhance system stability.

Wiring Safety & Best Practices

Insulation Check: Perform insulation resistance testing (≥ 1 MΩ at 500 V DC) on all wiring before energizing the device.

Torque Specifications: Tighten terminal screws to 0.8–1.2 N·m (confirm via ABB manual) to prevent loose connections and overheating.

Compliance: Adhere to IEC 60947, NFPA 79, and local electrical codes during installation. Refer to ABB’s MMS3120 series installation guide for country-specific requirements.

Labeling: Clearly label all wires with terminal numbers and signal descriptions for maintenance convenience, consistent with ABB’s documentation standards.

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